Answer:
all of the above
Step-by-step explanation:
The question refers to stoichiometry of a balanced chemical reaction. When a chemical reaction is balanced, the mole ratio of reactants and product are of utmost importance in making any kind of calculation involving the reaction.
We could determine;
I) the mass of another reactant
II) the mass/ number of moles of product by just taking the mole ratio of the species involved.